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1.
Describe two important ways in which weight and mass differ and one important way in which
they are related.
Answer:
Mass by definition is the measure of an object’s inertia which is the force needed to accelerate an object. However, weight
by definition is the force that causes an object’s acceleration due to gravity. Another difference is that the mass of an object
doesn’t change no matter where the object is moved to, while the weight of an object changes when moved to other places
when the acceleration due to gravity changes. One important way they are related is that they are directly proportional to
each other.
2.
According to Newton’s first law, if no force acts on an object, it will just continue moving.
Explain in terms of Newton’s first law why a car engine must exert a force between the car and the
road to drive at a constant speed on a straight and level road.
Answer
Newton’s first law is about balanced forces which result in zero net force. If an object is at rest and remains at rest then that
means there is no net force acting on it to make it change its acceleration. Also if the object was moving and continues to
move at a constant velocity then that means the forces causing that motion are balanced and the total net force acting on the
object is zero. That being said, if this car is to keep moving in a constant speed on a straight road then the forces acting on it
must be balanced. This means the engine has to exert force that is of the equal magnitude but opposite direction to the other
forces of friction( ground and air frictions).
…
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